Vitz PERFORMANCE MODS HELP REQUIRED!!!

ppl i need your help!!

we have a 2003 model vits which i've head for 3 and a half years now..... its been pretty much stock and unfortunately hasnt been maintained that much.... now that i have my own car.....and the vitz is just standing at home...and i want to do some performance modifications.....

the engine bit i can handle.... i need help with two things...

1. can i install after market fourwheel disk brakes??? if yes then which brand from where and tentative prices???( if anyone's done that to their vitz plz share yer experience)

2. the car's shocks are busted.... i dont wanna replace them with stock shocks but performance ones..... are performance shocks of stiffer specs available for vitz??? what brand price etc plz??!!

i've got 55 grand in hand, in which the car needs some serious body work too....will this budget cover it or will i need more??